Quadrilateral space syndrome: The forgotten differential

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Abstract

The quadrilateral space is bounded by the teres minor superiorly, the teres major inferiorly, the long head of the triceps medially and the shaft of the humerus laterally. The axillary nerve and posterior circumflex humeral artery pass through this space to enter the posterior compartment of the upper arm. Quadrilateral space syndrome (QSS) is caused by entrapment of the axillary nerve or its main branches and/or the posterior circumflex humeral artery in the quadrilateral space by internal or external compression. QSS can often be difficult to diagnose, given that patients may present with non-specific symptoms. As such, patients may be misdiagnosed with more common disorders of the shoulder. We report a case of QSS masquerading initially as rotator cuff pathology with positive impingement signs.

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Hong, C. C., Thambiah, M. D., & Manohara, R. (2019). Quadrilateral space syndrome: The forgotten differential. Journal of Orthopaedic Surgery, 27(2). https://doi.org/10.1177/2309499019847145

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